Charge carrier dynamics in PDPP-F/PCBM heterojunction solar cells

Abstract

The morphology dependent of migration and recombination kinetics of charge carriers in the polymer solar cell based on poly {2,7′-9,9-dioctylfluorene-alt-5-diethylhexyl-3,6-bis(5-bromothiophen-2-yl)pyrrolo[3,4-c]-pyrrole-1,4-dione}(PDPP-F) was investigated with photo-induced charge carrier extraction by linearly increasing voltage technique. The recombination coefficient of charge carriers decreased and the mobility of charge carriers increased, after the mass ratio of [6,6]-phenyl-C61-butyric acid methyl ester(PCBM) increased from 3:2 to 2:1. Meanwhile, both of them were sensitive to the applied electric field and could be together responsible for the improvement of voltage performance of polymer solar cell.

Keywords

Solar cell / Bulk-heterojunction / Charge carrier transport / Charge carrier recombination

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